Imagine seeing lasting visual disturbances, like a grainy screen or trails behind moving objects, even long after you've used certain drugs. That's what Hallucinogen Persisting Perception Disorder, or HPPD, is all about. It can happen after taking drugs like psychedelics, dissociatives, cannabis, and even some other medications. People with HPPD might see things like visual snow, bright halos around objects, or colors that seem too intense.
To figure out if someone has HPPD, doctors first need to rule out other medical or mental health conditions, and these visual changes must be causing real trouble in their daily life. It often gets confused with other drug-related mental health issues. HPPD comes in two main types, with one type involving more constant and bothersome changes to vision.
It's surprising, but some individuals experience these symptoms after using a drug just one time, suggesting that some people might be more prone to it. A variety of substances, not just what you might think of as classic hallucinogens, have been connected to causing HPPD. What's important to remember is that people with HPPD know that what they are seeing isn't actually real, which is different from a condition like psychosis. Feelings of anxiety or stress can also make these visual distortions feel much more intense.
Unfortunately, there isn't a known cure, but doctors strongly advise people to stop all recreational drug use. Making healthy lifestyle choices, like improving sleep and reducing stress, is also really helpful, and some specific medications are sometimes tried, though they don't always work for everyone.
